Encyclopaedic Dictionary of Upanisads, Vol. 3

"There is a mass of red flesh in the middle of the heart. In it, there is a lotus called dahara. It buds forth in many petals like a water-lily. In the midst of it is an ocean (samudra). In it's midst is a koka (bird). In it there are four nadis. They are rama, arama, Ichchha and punarbhava. Of these, rama leads a man of virtue to a happy world. Arama leads one of sins into the world if sins. (Passing) through Ichchha (nadi), one gets whatever he remembers. Through punarbhava, he splits open the sheaths; after splitting open the sheaths, he splits open the skull of the head; then he splits open prthvi (earth); then apas (water); then tejas (fire); then vaju (air); then akas (ether). Then he splits open manas (mind); then bhutadi (evolving source of all beings); then mahat (cosmic intelligence); then avyakta (unmanifested); then akshara (imperishable); then he splits open mrtyu (death) and mrtyu becomes one with supreme
G-d."---Encyclopaedic Dictionary of Upanisads, Vol. 3, by Swami Parmeshwaranand

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